James p



(No Model.)

J. F. DYER.

TRBADLE MOTION. No. 301,810. v U Patented July 8, 1884.

:wiag I mi 9 \ml UNITED STATES PATENT; OFFICE.

JAMES F. DYER, OF ATLANTA, GEORGIA.

TREADL E- MOTION.

SPECIPICATIONTorming part of LettersPatent No. 301,810, dated July 8,1884.

Application filed April 18, 1884.- (N model.)

To all whom it may concern.-

Be it known that I, JAMES F. DYER, a subject of the Queen of England,residing at Atlanta, in the county of Fulton and State of Georgia, haveinvented certain new anduseful Improvements in Treadle-Motions; and I dohereby declare the following to be'a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

My invention relates to improvements in treadle-motions or foot-powersforlight machinery; and it has for its object to reduce the fatigueinherent to such powers or motions, and also to avoid dead-centers.

The invention consists in providing the driven shaft with a doublecrank,'one of which is longer than the other, operated from a pitman andfrom a lever and pitman, respectively, connected with a treadle-bar,said parts forming practically or substantially a parallelogram.

The invention further consists in arranging the two cranks so that onewill be slightly in the lead of the other-that is to say, by setting thewrist-pin of one of the cranks on a line parallel with the driven shaft,but not in the same plane,whereby the liability of a stop- M bor.

page of the cranks on their dead-centers is greatly diminished, if notabsolutely avoided, all substantially as hereinafter more fullydescribed.

In the annexed drawings I have illustrated my invention in itsapplication to a grindstone, though it may be applied to any othermachinery adapted to be operated by footpower.

Figure 1 is an isometrical view of a grindstone frame and grindstone,showing the double crank 011 the grindstone-arbor on lines parallel withand in the plane of the said ar Fig. 2 is a like View showing one of thecranks of the arbor set to lead the other crank thereof. Fig. 3 is adetail View of the arbors detached on an enlarged scale, to better showthe relative position of the cranks, and Fig.

4 4 shows bya diagram a different application of the operatingdcvices.

' Like letters of reference indicate like parts in the above figures ofdrawings.

F indicates the frame, Gthe grindstone, and B the bearings bolted tosaid frame, and in which the grindstone-arbor A is mounted, said frameand bearings being of any usual or preferred construction.

As shown in Fig. 1, the arbor A has two cranks, O O. The former isconnected by pitman P to a treadle-bar, T, and said bar is connected tothe extremity of the arm 1 of a twotigue resulting from the applicationof the po wer,is greatly reduced, inasmuch-as I obtain the same powerfrom a treadle having one half the risethat is to say, supposing thepower required to drive a grindstone of given weight and diameter by asingle crank on its arbor will require a crank describing an arc ofacircle of, say, four inches in diameter, by employing a double crank, OO, and making the latter four inches long, the length of the former canbe reduced one-half, thus giving the treadle a rise and fall of twoinches. In other words, I reduce the power necessary to drive the stoneby one-half. In the relative arrangement of cranks as described, and asshown in Fig. 1, the axes of both of the cranks and shaft lie in thesame vertical plane when on their vertical dead-center, for instance;consequently the stone cannot be rotated except by moving the cranksbeyond their dead-center, and by other means than through thetreadlebar. This I obviate by setting the wrist-pin c of crank C so thatthe axis of said pin will lie in a different vertical plane from that ofthe arbor A and the wrist of the crank O,

as plainly shown in Figs. 2 and 3, thus causing the longer crank,operated indirectly from the treadle through the lever L, to slightlylead thecrank operated directly from said treadle, whatever may be thedirection of ro- IOO tation of the stone. From this arrangement it willbe seen that a stoppage on a dead-center becomes almost animpossibility, while an additional amount of power is gained through theextended sweep of the wrist-pin c.

As stated above, the treadle-motion is appli'- cable to other mechanismsor machinery, and I do therefore not desire to limit myself to itsapplication to grindstones; nor do I wish to limit myself to thecombination, with a footpower, of a double-crank shaft having one of itscranks of greater length than the other, as it is obvious that the powermay be applied to the lever L by extending its upper or lower end andreversing the connection of the cranks therewith. Forinstance, ifthelever is extended and power applied to theextensionas that of apiston, for examplcor said lever is operatcd by hand, the pitman Iinstead of being connected with the crank G, will be connected with thecrank 0, thereby reducing the throw of the lever, and through it that ofthe piston. It is obvious that such an arrangement could beadvantageously applied for driving a circular saw by hand, and insteadof reversing the connections, as set forth, the crank C may be madelonger radially, ,as shown in diagram, Fig. i.

Having now described my invention, what I claim, and desireto secure byLetters Patent, 1s-

1. The combination, substantially as herein described, of a power-lever,a double-crank shaft having cranks of different radiallengths, andconnecting-rods for connecting the cranks to the power-lever to transmitthe power applied thereto to both cranks simultaneously, for thepurposes specified.

2. The combination, substantially as herein described, of a power-lever,a double-crankfi o shaft the wrists of which are arranged in differentvertical planes, whereby one of the cranks is made to lead the other,and connecting-rods for connecting said cranks to the power-lever totransmit the power applied thereto to both cranks simultaneously, forthe purposes specified.

3. The combination, substantially as herein described, of a power-lever,a double-crank shaft having cranks of different radial lengths, thewrists whereof are arranged indifferent vertical planes, andconnecting-rods for connecting both cranks with the power-lever, for thepurposes specified.

i. The combination, substantially as herein described, of a power-leyer,atreadle connected thereto, a double-crank shaft having cranks differingin radial length, and connecting-rods for connecting one of the crankswith the treadle and the other with the power-lever, for the purposesspecified.

5. The combination, substantially as herein described, of a power-lever,a treadle connected thereto, a double-crank shaft having cranksdiffering in radial length, the wrists whereof lie in different verticalplanes, and connect ing-rods for connecting one of said cranks with thetreadle and the other with the power-lever, for the purposes specified.

In testimony whereof" I affix my signature in presence of two witnesses.

, JAMES F. DYER.

YVitnesses:

O. E. JARVIS, DANIEL Irrcnronn.

